That's not true. You'll go out of ketosis if you eat a sandwich. Especially one as huge as a Subway roll. A six inch has 37 grams of carbs in the bread alone, and most low carbers stick to under 20 per day.

>most low carbers stick to under 20 per day.

I'm going to need to see a source on that.

Ancedotally, I do 50-100 and do just fine.